Full user review
"Seems to be easy to use."
You can click on the icon from the quick-launch bar and adjust this as you need it. If you are using a mouse with a scroll wheel you can rotate the scroll wheel to adjust the size of the magnification. Escape will send the window back to normal.
May be a slight blurring at large magnification but that would occur with most enlargements.
Should prove to be very useful as some of the print in some windows can be very small. I was looking for something to give me the magnification that I have on my Mac without having to jump through hoops and this is fine for my usage.